There's a complete list of new features here: http://www.apple.com/macosx/whats-new/features.html http://www.apple.com/macosx/whats-new/features.html To addres

There's a complete list of new features here: http://www.apple.com/macosx/whats-new/features.html http://www.apple.com/macosx/whats-new/features.html To address the concerns of re-installation, they're including a partition with the system install disk on it (which can get to Time Machine or whatever else you need).